IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
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Transformer feedback millimeter-wave VCO with capacitance cancellation technique in 0.18-µm CMOS
Milad AtaeiAbdolreza NabaviAmir NikpaikJavad Meiguni
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2011 Volume 8 Issue 11 Pages 780-787

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Abstract

This paper describes a design procedure for mm-wave voltage controlled oscillator (VCO), based on large signal behavior of oscillator transconductance. Then, a new structure of LC-VCO is presented, which utilizes a transformer feedback to enhance the transconductance of the core transistors and to cancel the undesired parasitic effects. Using a 0.18-µm RF CMOS technology, the advantage of this VCO is examined by large signal analysis and simulation. The results illustrate improvement of 5dB in phase-noise and 70% in tuning-range, compared to enhanced active gain conventional transformer feedback VCO. Finally, a compact layout for transformer design is proposed.

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© 2011 by The Institute of Electronics, Information and Communication Engineers
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